Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Current assets
Cash and cash equivalents	$ 33,797	$ 46,877
Accounts receivable, net	34,978	35,071
Inventories, net	126,647	120,023
Prepaid expenses and other current assets	10,203	10,062
Total current assets	205,625	212,033
Property, plant and equipment, net	35,779	37,204
Long-term restricted cash	101	104
Other assets	11,515	19,904
Total assets	253,020	269,245
Current liabilities
Accounts payable	17,642	19,551
Accrued compensation	7,916	8,285
Warranty	2,589	3,556
Income taxes	210	495
Deferred revenue	8,398	10,786
Other current liabilities	4,070	4,799
Total current liabilities	40,825	47,472
Long-term deferred revenue	761	1,488
Other long-term liabilities	5,771	5,730
Total liabilities	47,357	54,690
Commitments and contingencies (Note 10)
Stockholders' equity
Preferred stock
Common stock	108	107
Additional paid-in capital	502,351	499,332
Treasury stock	(1,218)	(1,218)
Accumulated deficit	(298,942)	(288,443)
Accumulated other comprehensive income	3,364	4,777
Total stockholders' equity	205,663	214,555
Total liabilities and stockholders' equity	$ 253,020	$ 269,245